When I had you rev the engine, it didn't vary the thump. Maybe under load driving down the road is different. I was under the impression that it thumped all the time, no matter what.

If it actually stops with a heavier load we may just need to adjust it! Compare the ride height with the specs in the manual and see if the car is high in the rear. I thought it was kind of odd that the rod was adjusted as short as it could go.

Oh, and to readers- this is a '4Matic', which I neglected to mention.

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1968 230S Automatic, Elfenbein
1975 O309D Executive Westfalia Camper Bus, Blau/ Weiss
1972 280SEL 4,5 Dunkelrot
1966 VW Type 34 "Grosser" Karmann-Ghia
1963 VW 1500 Variant Pearlweiss
1969 VW Variant Automatic, Perugruen
1971 VW Squareback Automatic, Clementine Orange
2001 E320 4Matic Wagon- Our belated welcome to the 21st century! Polar White
1973 280SEL 4,5 Sliding Roof "The Bomb", Dunkelblau.